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| Dual-Channel, 14-Bit HD Image Signal Processor with Precision Timing Core AD9978A FEATURES Dual AFE channels 1.8 V analog and digital core supply voltage Serial data output with reduced range LVDS outputs Differential analog inputs CDS or SHA configuration (CDS bypass) with -3 dB, 0 dB, +3 dB, and +6 dB gain 6 dB to 42 dB, 10-bit variable gain amplifier (VGA) 14-bit, 75 MHz analog-to-digital converter (ADC) Black level clamp with variable level control Precision Timing core with 210 ps resolution @ 75 MHz GENERAL DESCRIPTION The AD9978A is a highly integrated, dual-channel, chargecoupled device (CCD) signal processor for high speed digital video camera applications. Each channel is specified at pixel rates of up to 75 MHz and consists of a complete analog front end (AFE) with ADC conversion. The Precision TimingTM core allows adjustment of the correlated double sampler (CDS) and sample-and-hold amplifier (SHA) clocks with 210 ps resolution at 75 MHz operation. The AD9978A also contains a reduced range low voltage differential signaling (LVDS) interface for the dualchannel data outputs. Each analog front end includes black level clamping, a CDS, a VGA, and a 75 MHz, 14-bit analog-to-digital converter (ADC). Operation is programmed using a 3-wire serial interface. Packaged in a space-saving, 6 mm x 6 mm, 40-lead LFCSP, the AD9978A is specified over an operating temperature range of -25C to +85C. APPLICATIONS Digital video cameras Digital still cameras Digital copiers Multifunction printers High speed industrial cameras FUNCTIONAL BLOCK DIAGRAM AD9978A VREF INP_A INM_A 6dB TO 42dB CDS/ SHA VGA ADC DOUT0P DOUT0N DOUT1P DOUT1N TCLKP TCLKN DOUT2P DOUT2N DOUT3P DOUT3N -3dB, 0dB, +3dB, +6dB -3dB, 0dB, +3dB, +6dB INP_B INM_B 6dB TO 42dB CDS/ SHA VGA CLAMP CLAMP ADC LVDS SERIALIZER INTERNAL CLOCKS CLK_OUT Precision Timing CORE CLI SYNC GENERATOR INTERNAL REGISTERS 07751-001 HD VD SL SDATA SCK Figure 1. For more information about the AD9978A, contact Analog Devices, Inc., at afe.ccd@analog.com. Rev. Sp0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 (c)2008 Analog Devices, Inc. All rights reserved. AD9978A NOTES (c)2008 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D07751F-0-11/08(Sp0) Rev. Sp0 | Page 2 of 2 |
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